Information Processing Device, Method, and Medium

10. The information processing device according to claim 1, wherein the processor accumulates information, by which another user terminal that was present within the predetermined distance from the user terminal of the user for a predetermined amount of time or more when the user engaged in the predetermined action is identifiable, as the identification information of the one or more accompaniers.

11. The method according to claim 8, wherein the computer accumulates information, by which another user terminal that was present within the predetermined distance from the user terminal of the user for a predetermined amount of time or more when the user engaged in the predetermined action is identifiable, as the identification information of the one or more accompaniers.

12. The computer-readable recording medium according to claim 9, wherein the computer accumulates information, by which another user terminal that was present within the predetermined distance from the user terminal of the user for a predetermined amount of time or more when the user engaged in the predetermined action is identifiable, as the identification information of the one or more accompaniers.